Fix: don't think that string with '.linkonce' is a message from bjam. This

string can be contained in names of unresolved symbol and was causing failure
during parsing.

Also, accept log name as argument. It's not possible to debug under gdb
with input redirection.


[SVN r22997]

tools/regression/process_jam_log.cpp

@@ -444,9 +444,15 @@ int cpp_main( int argc, char ** argv )
     --argc; ++argv;
   }
 
-  locate_root = argc > 1 
-    ? fs::path( argv[1], fs::native )
-    : boost_root;
+  if (argc > 1)
+  {
+      locate_root = fs::path( argv[1], fs::native );
+      --argc; ++argv;
+  } 
+  else
+  {
+      locate_root = boost_root;
+  }
 
   std::cout << "boost_root: " << boost_root.string() << '\n'
             << "locate_root: " << locate_root.string() << '\n';
@@ -457,13 +463,23 @@ int cpp_main( int argc, char ** argv )
   string content;
   bool capture_lines = false;
 
+  std::istream* input;
+  if (argc > 1)
+  {
+      input = new std::ifstream(argv[1]);
+  }
+  else
+  {
+      input = &std::cin;
+  }
+
   // This loop looks at lines for certain signatures, and accordingly:
   //   * Calls start_message() to start capturing lines. (start_message() will
   //     automatically call stop_message() if needed.)
   //   * Calls stop_message() to stop capturing lines.
   //   * Capture lines if line capture on.
 
-  while ( std::getline( std::cin, line ) )
+  while ( std::getline( *input, line ) )
   {
     if ( echo ) std::cout << line << "\n";
 
@@ -507,7 +523,10 @@ int cpp_main( int argc, char ** argv )
       || line.find( "Link-action " ) != string::npos
       || line.find( "vc-Link " ) != string::npos 
       || line.find( ".compile.") != string::npos
-      || line.find( ".link") != string::npos
+      || ( line.find( ".link") != string::npos &&
+           // .linkonce is present in gcc linker messages about
+           // unresolved symbols. We don't have to parse those
+           line.find( ".linkonce" ) == string::npos )
     )
     {
       string action( ( line.find( "Link-action " ) != string::npos
@@ -616,5 +635,7 @@ int cpp_main( int argc, char ** argv )
   }
 
   mgr.stop_message( content );
+  if (input != &std::cin)
+      delete input;
   return 0;
 }